Circuit Emulation Service Modules; Circuit Emulation Service Module (4-Port) - Cisco MGX 8220 Installation And Configuration Manual

Circuit Emulation Service Modules

Circuit Emulation Service Modules

Circuit Emulation Service Module (4-port)

The 4-port Circuit Emulation Service Module (CESM) is a two-card set consisting of a CESM front
card and a 4-port back card for T1 or E1 lines. The E1 line module cards are further categorized by BNC
or DB15 connector type. The three possible line modules are
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•
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Up to 10 CESMs may be installed in a shelf in slots 5 through 14. A 1:N redundancy is supported
through the SRM-T1E1 board.
The main function of the CESM cards is to provide a constant bit rate (CBR) service for T1/E1 ports
over ATM BPX 8620 network.
The CESM converts DS1/E1 data streams into CBR AAL1 cells for transport across the ATM network.
The CPE clock source should be configured in "loop" mode.
CESM card supports either 4 T1 or 4 E1 ports. Each T1 or E1 port supports a single synchronous
unstructured data stream with a data rate of 1.544 Mbps or T1 and 2.048 Mbps for E1. Data rates are
not configurable. A single CESM card supports up to four connections.
Timing for the two ends of a CBR connection (termination at the MGX 8220 shelf) must be the same
Stratum reference.
Performance monitoring of user applied structure (framing) is not supported.
The 4-port CESM card supports loopback diagnostics features through the addchanloop and addlnloop
commands. Refer to the Cisco MGX 8220 Command Reference for details of these commands.
An illustration of the CESM card is provided in Figure 4-14.
Cisco MGX 8220 Installation and Configuration
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LM-DB15-4T1
LM-DB15-4E1
LM-BNC-4E1
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
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